Pile type prestressed anchor cable for high-ground-temperature tunnel support

Abstract

The invention discloses a pile type prestressed anchor cable for a high-ground-temperature tunnel support. The pile type prestressed anchor cable is characterized by comprising a first anchor cable (1), a second anchor cable (2), a tail end (4), a grouting body (5) and a spiral pipe (7). According to the pile type prestressed anchor cable, the structure stress performance of the grouting body of an anchorage section of the anchor cable is improved, the adhesive force between the anchor cable and the grouting body is improved, the anchoring force of the anchor cable is improved, good heat insulation and heat dissipation effects can be achieved, adverse effects of high ground temperature on an anchorage body are overcome, and the durability of the anchor cable is improved.

Description

technical field [0001] The patent of the present invention relates to a pile type prestressed anchor cable for high ground temperature tunnel support. Background technique [0002] A large number of railways, highways and hydropower projects have been built, and a large number of deep-buried long tunnel projects have emerged. Deep-buried tunnels will encounter high ground temperature disasters. For example, the Qinling Tunnel on the Xikang Railway in my country has a maximum buried depth of 1600m and a ground temperature of 40°C. , the maximum buried depth of the Gaoligongshan Tunnel is 1167m, and the ground temperature reaches 60°C; the maximum buried depth of the Medog Water Diversion Tunnel is 4000m, and the ground temperature reaches 90°C. [0003] In the high ground temperature area, the high temperature released in the rock mass will have a great impact on the prestressed anchor cables of tunnels and underground engineering. High temperature will affect the structural ...

AI Technical Summary

Problems solved by technology

High temperature will affect the structural mechanical performance of the grouting body in the anchorage section, resulting in a decrease in the adhesion between it and the anchor cable, causing relative slippage between the anchor cable and the grouting body, and even pulling out the anchor cable; high temperature may also cause It will lead to cracks in the grouting body, which will not only affect the strength of the grouting body and reduce the adhesion, but also lead to increased corrosion of the anchor cable and affect the durability of the anchor cable

At present, domestic prestressed anchor cables mainly adopt the method of yielding pressure to reduce the influence of temperature stress on the surface of surrounding rocks, while other anchor cables used in high ground temperature conditions are less, and the technical measures for the influence of high ground temperature on the anchoring effect of anchor cables are basically blank. state

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